/**
 * Cosine Similarity
 * src/metric/Cosine.ts
 *
 * @see https://en.wikipedia.org/wiki/Cosine_similarity
 *
 * Cosine similarity is a metric used to measure how similar two vectors are, regardless
 * of their magnitude. In text analysis, it is commonly used to compare documents or
 * strings by representing them as term frequency vectors and computing the cosine of
 * the angle between these vectors.
 *
 * The result is a value between 0 and 1, where 1 means the vectors are identical and
 * 0 means they are orthogonal (no similarity).
 *
 * @module Metric/CosineSimilarity
 * @author Paul Köhler (komed3)
 * @license MIT
 */
import type { MetricInput, MetricOptions, MetricCompute } from '../utils/Types';
import { Metric } from './Metric';
export interface CosineRaw {
    dotProduct: number;
    magnitudeA: number;
    magnitudeB: number;
}
/**
 * CosineSimilarity class extends the Metric class to implement the Cosine similarity algorithm.
 */
export declare class CosineSimilarity extends Metric<CosineRaw> {
    /**
     * Constructor for the CosineSimilarity class.
     *
     * Initializes the Cosine similarity metric with two input strings or
     * arrays of strings and optional options.
     *
     * @param {MetricInput} a - First input string or array of strings
     * @param {MetricInput} b - Second input string or array of strings
     * @param {MetricOptions} [opt] - Options for the metric computation
     */
    constructor(a: MetricInput, b: MetricInput, opt?: MetricOptions);
    /**
     * Calculates the term frequency vector for a given string.
     *
     * @param {string} str - The input string
     * @param {string} delimiter - The delimiter to split terms
     * @return {Map<string, number>} - Term frequency object
     */
    private _termFreq;
    /**
     * Calculates the Cosine similarity between two strings.
     *
     * @param {string} a - First string
     * @param {string} b - Second string
     * @return {MetricCompute<CosineRaw>} - Object containing the similarity result and raw values
     */
    protected compute(a: string, b: string): MetricCompute<CosineRaw>;
}